Revert example changes from previous commit

Restore 3D_acoustic_support3/case.py format back to 1 (silo_hdf5).
Remove 3D_blast_wave/ example added for demo purposes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sbryngelson

examples/3D_acoustic_support3/case.py

@@ -46,7 +46,7 @@
             "bc_z%beg": -6,
             "bc_z%end": -6,
             # Formatted Database Files Structure Parameters
-            "format": 2,
+            "format": 1,
             "precision": 2,
             "prim_vars_wrt": "T",
             "parallel_io": "T",